Nagledni materiali po sot͡s︡ialisticheskoto sŭrevnovanie
By: Licho Lichev, Iskro Kosev.
Publisher: Nauchnoizsledovatelski in-t po profsŭi͡u︡zni problemi "G. Dimitrov" pri T͡S︡S na BPS
Published: 1980
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 82